Restructuring Charges (Composition of Restructuring Charges) (Details) - USD ($)	3 Months Ended
	May 04, 2019	May 05, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 30,000,000
Best Buy Mobile [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	30,000,000
Cumulative Amount	56,000,000
Best Buy Mobile [Member] | Property and equipment impairments [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative Amount	1,000,000
Best Buy Mobile [Member] | Termination benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		1,000,000
Cumulative Amount	6,000,000
Best Buy Mobile [Member] | Facility closure and other costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 29,000,000
Cumulative Amount	$ 49,000,000